Eobeet haedib



(No Model.) 'l

R. HARDIB.

PUMP.

No. 297,076. PatentedApr. 15, 1884.

IIN

N, PETERAS. Pmwuumgnpmrv wnshmgm, o. c

emi-w i Erler-ns Nrrn Artnr irren.

ROBERT HARDIE, OF HOBOKEN, NEW JERSEY, ASSIGN OR OF ONE-HALF TO JOHN A.WALSH, OF NEW' YORK, N. Y.

SPECIFICATION forming part of Letters Patent No. 297,076, dated April15, 1884.

Application filed April 16,1883.

To a/ZZ whom, t may cm1/cern,.-

. Be it known that I, ROBERT HARDIE, of Hoboken, in the county of Hudsonand State of New Jersey, have invented certain new and usefulImprovements in Pumps, of which the following is a specification.

My invention is more especially 'adapted for pumps for ships and othervessels.

The invention relates to pumps having but two valves, and in which theplunger1 or rod to which the piston or bucket is attached is madehollow, and provided with openings in its lower end, so as to serve asan air-chamber, whereby the pump is made to have a double delivery-thatis to say, to deliver water-during the stroke of the pump in bothdirectionsand the delivery is niade as nearly as possible continuous.

The invention consists in novel details of construction and combinationsof parts hereinafter described, and pointed out in the claim.

Y The accompanying drawing represents a vertical section of an apparatusembodying my improvement.

A is the cylinder or barrel of the pump. b is theI seat for thefoot-valve, which extends across the bottom of the cylinder or barrel,and which may be formed of the same casting as the cylinder-bottom ofthe casing A. This valve-seat Z) is provided with a circular series ofholes or openings, c, to allow the water to pass through.

d is the foot-valve, which is adisk of leather or soft rubber; and e isa valve-guard which passes .through the valve d, and, screwing into thevalve-seat b, serves to keep the said valve in place and to protect thesame. This guard is also furnished with water-openings f.

g is the piston or bucket, which may be packed in any suitable mannerwith any packing material, as h. The piston or bucket g has in it acircular series of holes or openings, i, similar to those in thevalve-seat b, for the passage of the water.

j is the delivery-valve, of leather or soft rubber, which is held inplace on the piston g and over the openingsz' by the lower end of theplunger or piston rod K,which is secured (No model.)

to the piston in any appropriate manner-as, for instance, by screwinginto the same. The lower end of the rod or plunger `"K is rounded orhemispherical in shape, so as to form a guard for the flexibledelivery-valve j. As here shown, the rod or plunger K has at its lowerend an integral stud or projectiomwhich is screw-threaded, and on whichthe piston or bucket g is screwed, the delivery-valve j being clampedbetween said bucket or piston 6o and the end of the rod or plunger. Thisplunger or piston rod is made in the form of a hollow cylinder, closedat its top, and having its bottom provided with openingsl for theadmissionof air and water, thus forming an airchamber.

The casing or pump-cylinder A has an ordinary discharge-spout, n, closedat its top, except where the hollow piston-rod K passes through it, andwhere it is itted with a neck- 7o leather, m, or other packing. The areaof the transverse section of the plunger K should be about one-half ofthe area of the transverse section of the pump-cylinder A,in order thatthe pump may deliver equal quantities of water during the up and downstrokes. In the upward stroke of the piston the water llls the lowerpart of the cylinder below the piston or bucket above the foot-valve d.In the `downward stroke of the piston the water is So forced up throughthe `bucket-valve or delivery-valve into the annular space between thecylinder A and the hollow plunger K; and as the area of the transversesection of the plunger is so proportioned that the plunger will displaceabout half the contents of the cylinder, only half of the water in thecylinder is expelled during the upward stroke, the other half beingexpelled during the downward stroke. The pump thus, though taking in all9o the water in the upward stroke, discharges half of it during eachstroke in either direction.

The hollow plunger K may be worked by any suitable means. I do notclaim, broadly, a pump having a hollow rod or plunger to which thepiston or bucket is attached,and which serves as an airchamber.

Having now described my invention, what I roo Claim as new7 and desireto seeure by Letters projection, and the flexible delivery-valvej,Pate1it,is clamped between the piston `or bucket; and

The eo1nbinution,\vith the cylinder A, pro the integral end of Suid rodor plunger the vided with a foot-valve, of the hollow rod or end of Suidrod or plunger forming a guard for 5 plunger having zr rounded lower endformed said delivery-valve,Substantially as described. 15

integral with it, and provided WiL-h openings Z, so that the rod orplunger muy serve an RBT' HARDIE' air-Chamber, and also provided with aninte- Vitnesses: gral screw-threaded stud or projection, the T. J.KEANE, 1o piston or bucket g, screwed upon said stud or l FREDK. HAYNES.

